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Finding the Fourth Proportional to 18,647.63, 25,731.62 and 10,990.40

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Solution

The fourth proportional to 18,647.63, 25,731.62 and 10,990.40 is: 15,165.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,647.63 : 25,731.62 = 10,990.40 : x
  2. Step 2: Convert to fraction form
    18,647.63/25,731.62 = 10,990.40/x
  3. Step 3: Cross multiply
    18,647.63x = 25,731.62 × 10,990.40
  4. Step 4: Simplify right side
    18,647.63x = 282,800,938.26
  5. Step 5: Solve for x
    x = 282,800,938.26/18,647.63
  6. Step 6: Final answer
    x = 15,165.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.